The move puts the Phillies at 39 on the 40-man roster. They could need a spot for Joe Blanton, who currently is on the 60-day disabled list and pitching in his first rehab game Friday.

Also, do not rule out a possible acquisition of Aaron Rowand. The former Phillies outfielder was designated for assignment by San Francisco on Wednesday and is a favorite of Charlie Manuel's.

The Giants have said they will cover the remainder of Rowand's salary, which includes $12 million due in 2012. Rowand would not be eligible for the postseason in 2011, but he could compete for a bench job next spring.

Carpenter was designated for assignment during the first week of spring training but still appeared in six games for the Phillies this season. The 28-year-old had a 7.71 ERA. He will join the Padres on Saturday.

Converted from a starter to relief this spring, he experienced a great deal of success at triple-A Lehigh Valley. In 60 1/3 innings, Carpenter posted a 1.79 ERA with 65 strikeouts and only 11 walks.